Bacteriology Introduction

Bacteriology Introduction

Assistant Prof. Dr. Karreema Amine AL-Khafajii
Babylon University, College of Medicine, Department of Microbiology.

Cells in our World come in two basic types; prokaryotic(has no nucleous) and eukaryotic (has nucleous). and the main difference between them are;
Differences between Prokaryotic cells and Eukaryotic cells.

Prokaryotes
• Prokaryotic cells are the smallest, simplest and most abundant cells on Earth.
• Most prokaryotes range in size from 1-10 micrometers (µm).
• Prokaryotes include bacteria and archaea (ancient bacteria)
• Prokaryotes lack a nucleus and complex organelles.
• Bacteria are classified and named based upon their genetic structure, physical structure, and metabolism.
Bacterial Shapes & Arrangements Prokaryotes (bacteria) are smaller (1-10 micrometers, um) than Eukaryotic cells and can be distinguished by the lack of a membrane-bound nucleus. Prokaryotic cells have 3 major shapes: cocci, bacilli or spirilla. Bacterial cells can be arranged in different groups or patterns. These cells can be arranged singly, in pairs (diplo), groups of 4 (tetrads), chains (strepto), clusters (staphylo), packets of 8 or 16 (sarcinae), or hinged together (palisades).